Hey all, i was pressure testing my hybrid for leaks today, but i noticed something bad- air was escaping past my soda can burst disk. I hadn't tightened the union very much, so i think that might be part of the problem. My union is orientated the same way as SB15's on his handheld rifle if that is a piece of information you need.

also, i was PMin SB15 and he recommended adding an aluminum washer after the burst disc for more clamping power. I was just wondeirng since i don't have access to large metal drill bits or a milling machine, and i don't want to spend $30+ for one bit that i'll never use again, if i could make that out of plexiglass? I think i should be able to, but i'm not sure. I think the combustion would be quick enough so that the plexiglass doesn't warp, but what do you guys think?

Thanks for your help with both of my questions

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Sorry about that, I read your PM about the plexiglass washer, but didn't have time to respond at that particular instant. I then completely forgot about it.

Plexiglass may work, though I would be concerned with the potential for it to shatter when exposed to the shock loading of 300 - 700psi suddenly acting upon its surface. The only way to find out for certain is to cut out a washer, and test it.

Provided it does not shatter, melting should not be an issue.

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People should not be afraid of their governments. Governments should be afraid of their people.

Using aluminum foil instead of soda can disks will probably be easier, as well as cheaper. In a 1.5" union, 32 layers of aluminum foil will usually survive 400-450 psi. In a 1" union, more than twice that. And with only a butyl rubber gasket they seal nearly perfectly, even at 400+ psi.

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Spudfiles' resident expert on all things that sail through the air at improbable speeds, trailing an incandescent wake of ionized air, dissociated polymers and metal oxides.

i used a cam lock right at the end of my chamber for an interchangeable barrel system and i unscrewed my barrel from the male cam lock, put a burst disk in the female and put the male in it and locked it down tight worked like a charm. cam locks are really easy to come by where i live and really cheap too (aluminum is even cheaper than poly cam locks) I would personally use that cam locks i think it would make replacing the burst disks easier after each shot.